Switch.



B. HASKINS.

SWITCH.

APPLICATION FILED PERA, 1910.

Iateuted Jan. 5, 191.5.

B. HASKINS.

SWITCH.

APPLICATION .TILED ERBA, 1910.

Eatented Jan. 5, w15.

5 SHEETS-BHEET 2.

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B. HASKINS.

SWITCH.

APPLICATION FILED FEB.4,1910.

anante. gian. 5, 1915.

5 SHEETS-SHEET 3.

Gig. 5L

B. HASKINS.

SWITCH.

APPLICATION FILED FEB.4,1910

l, l 23,870. meme@ Jan. 5, 1915.

5 SHEETS-SHEET 4.

@VMM/maw @WY/onf @Mmm B. HASKINS.

SWITCH.

APPLICATION FILED PERA, 1910.

5 SHEETS-SHEET 5.

sriirns PATENT carrer. c

BRADLEY HASKIN S, OF MILWAUKEE, WISCONSIN ASSIGNOR, BY MESNEASSIGNMENTS, T0 ALLISQGHALMEBS MANUFACTUBNG COMPANY, AJCORPQRATION 0FDELAWARE.

SWITCH.

Speoicatoin of Letters Baten-t.

To all whom z't may concern:

Be it known that I, BRADLEY HAsxiNs, a

citizen of the United States, vresiding at Milwaulree, in the county ofMilwaukee and State of' llVisconsin, have invented certain new anduseful improvements in Switches, of which the following is a full,clear, and exact specication.

This invention relates -to improvements in switches and particularly inoil switches.

ln prior applica-tions -le'd for improvements in oil switches,` therehave been dis-A closed oil switches in the `forni. of a selfcontainedunit removable as a whole from the oil tank and from the line terminals,the stationary contact terminals being separable and the portions whichare conne ted to the line terminals being ixed in the ank, and

the portions which are engaged by the mov able bridging contactsformi-ng part of Athe removable unit. With this construction the partsof the switch, particularly the contacts, can be cleaned, repaired,adjusted, etc., conveniently land with safety, inasmuch as it isunnecessary for the workman or operator to work near any live parts andhe will not be compelled to work in cramped quarters or under thedisadvantage of a poor light such as frequently exists behindswitchboards, or need he be annoyed by oil dripping from the recentlyimmersed parts as is the case with the usual construction of switches.The present invention embodies improvement in switches such as justdescribed.

One of the objects of the present invention is the provision of a switchwhich may be utilized as a. double throw switch and having aconstruction such that the movable or bridging contacts can be caused tooperate with one of either of two sets of contacts or contact terminals,without requiring a which may be removed as a whole from the o1l tankfor the purpose of inspection, repairing, adjusting, etc.

Another .object is to improve the contact mechanism of switches ingeneral, and particularly to provide contacts which engage andydisengage each other in a manner such that the engaging faces of thecontacts will b e maintained in a Smooth and clean condition free fromgrit, dirt and Ismall particles of fused copper.

A still further object is the provision of a novel form of contactmechanism which permits the switch unit to be readily removed and,separated from the i'ixed contact terminals which are connected to theline'termina'ls, and which permits the unit to be again idrawings,Figure l is a longitudinal sectional view of thes'witch, parts beingbroken away, and portions or' the operating mechanism being shown inelevation. Fig. 2 is a trans; verse sectional view taken substantiallyalong `the line 2 2 of Fig. l, looking in the direction indicated by thearrows, and shows the switch in one of its closed positions. Fig. 3 is atransverse sectional view taken substantially along the line 3-3 of Fig.l, showing the switch in its open position looking in the directionindicated by the arrows. 4 is a somewhat similar View with the coverremoved and the switch unit partially removed from the tank. Fig. 5 is aplan view with the cover removed, the parts being shown somewhatconventionally or diagrammatically. Fig. 6 is a plan view of a portionof the operating mechanism, showing particularly the clutch which isemployed between the operating handle and switch; and Fig. 7 vis anenlarged Sectional view showing the coperating contact members in therelative positions lwhich they occupy when the switch is closed.

Referring now to the fi ures of the drawf ings', it will be seen that te switchincludes an oil tank 10 which is preferably formed from castmetal and is provided with a removable cover 11 secured to an extension12 of the tank by boltsv 13 which pass through the cover and engage insuitable lugs 14' at the corners of the extension. The extension 'l2 isin turn secured to the tank ina similar manner. rThe switch may be suported any suitable manner but prefera l ad]acent a switchboard (notshown). ecured by means of bolts 15 to wedge-shaped mem- 'bers 16, whichare held in channels 17 on the bottom of the tank adjacent opposite endsthereof, are two frames or brackets 20, and extending between thesebrackets and secured to the ends thereof in any suitable -manner arefour rods` 21, 22, 23 and 24 respectively, which are parallel and extendsubstantiallyithe length -of tank. The channels are formed by lugs 18,and the wed .shaped members are held in the channels Babbitt metal 19.These rods 2l, 22, 23, and 24 are designed to support certain contactterminals, the number of which depends upon the number of poles of whichthe switch is composed. As was before stated, I have here provided aswitch which may `be utilized as a double throw switch, and it may behere stated that in the preferred formv of my invention I provide oneach side of the switch sets of stationary contact terminals which areconnected respectively to supply and line or conducting terminals,

and I connect the contact terminals of eaclik set by means'of a movableor bridging contact mechanism which is designed to be shifted sidewiseof the tank. Accordingly for each pole of the switch I have two contactterminals'on each side of the switch, said terminal being adapted to .beconnected to the line terminals by means of the horizontal movablecontact mechanism. I have here shown a three-pole switch and there- Yfore each of the rods 21, 22, 23, and 24 carries three stationarycontact terminals 25. The contact terminals are clamped to the rods 21,22, 23, and 24 respectively by caps 26 and screws 27, the rods beingpreferably square as shown, and the terminals being separated from therods by insulation 27 a. Each contact terminal is provided with aninclined flat face 28 which is adapted' to be engaged by certain contactmembers to be referred to presently, and each one of the stationarycontact terminals has a threaded socket in which is secured a terminalrod 29 connected by a right-and-left-hand threaded coupler 30 'to lineterminals 31 which extend from the tank through open- A.ings 32. Thesebushings may be slid up on the line terminals so as to expose theconnections and permit the line terminalsto be separated from the rods29.

By referringfto Tig. 5 wherein the stationary contacts are shownsomewhat conventionally in order that the relative arrangement of theseparts may be made clear, it will be seen that the contact terminals 25which are mounted on rods 21, 22, 23, 24 are directly opposite eachother making possible a perfectly horizontal double throw switcharrangement. The general stationary electric connections ,are also shownin this figure. rlhe mechanism so far described constitutes the fixed ornormally non-removable part of the switch. The remaining parts of thecontact mechanism of the switch are mounted in a removable skeletonstructure including two end plates 34 and 35 which are h eldpredetermined distances apart by members to be referred to presently andare supported on rods 21l and 23a which act as slide rods. These endplates 34 and 35 are so supported that they, together with the mechanismcarried thereby, may be shifted longitudinally of the tank on the sliderods 21* and 232L and may be removed as a unit from the tank.

Supported in bearings 36 and 37 at the tops of the end plates 34 and 35is a rotary or oscillatory operating shaft 38, and mounted at or neareach extremity of said shaft 38 is a system of linkages comprising amain crank 39, which is mounted directly on the shaft 38, and downwardlyextending links 40 and 41, which are respectively pivoted to the twoends of the crank 39. These links 40 and 41 are provided with slottedportions 42 in which are secured and connected for movement other links43 and 43, and 44 and 44. One end of links 43 and 44 respectively areconnected to a central supporting rod 45', and as mentioned, the otherends of said links and also one end of links v when inI its normalposition is directly below the rotary operating shaft 38, and is adaptedto be shifted by said shaft and system of linkages and is guided in itshorizontal movements by members 46, which are secured to the rod 45 andare' slidable in slots 46* in the end plates 34 35. These members 46therefore serve as cross-heads for the rod 45 and also serve as cammingmembers to shift certain other parts when the shaft 38 and the partssupported thereby are shifted as will be explained presently. By thesystem of linkages, a rotary movement of the shaft 38 shifts the rod 45horizontally, or sidewise of the tank. Set screws 20 in projectingportions of the stationary end plates 20 bear against the end plates 34and 35 of the removable frame and act/ as reinforcing members when theswitch is moved to either closed position. The sidewise movement of therod45 is opposed by coil springs 47, which are mounted` on the rotaryshaft 38 with their ends embracin iianges 48 on the upper part of the enplates 34 and 35 respectively and projections 49 on the cranks 39.

Supported on the rod 45 and clamped thereto by means of screws 51 arethree moving contact member relative to the stationary contact terminalswill be best understood by referring to Figs. 2 and 5. Each of thebridging contacts is preferably in the form of irregular butsymmetrically shaped blocks which are provided on opposite sides andhave their ends received 1n sockets or thimbles 65, the outer ends ofwhich are rounded, as shown, and are received in sockets on the innersides of the contact members 62. Thus it will be seen that with thislconstruction the contact members 62 located on opposite sides of the arm60 are capable of movement toward and away from each other, and it maybe here sta-ted that these contact members are adapted to be compressedbetween the bridging contact members 52 and the stationary contactterminals 25. The contact members 62 of each pair are preferablyconnected together by 'flexible conductors 66 so that there will be goodconductivity between the stationary contact terminals andthe bridgingcontacts, and the outer ends of the arms 60 are provided with arcingtips 67 which are adapted to be engaged by the arcing contacts '55carried by the Contact levers 54.

As will be seen by referring particularly toFig. 3 the contactsupporting arms 60 are normally so inclined that the contact members 62carried by these arms are out of engagement with the ixed contactterminals and are also out of engagement with the bridging contacts.However, 1 have prowith inclined faces 53, parallel to the invided meanswhereby the contact members clined faces 28 of the contact terminals 25.Between the two parts of each bridging Contact member 52 are resilientarms or levers 54 at the outer ends of which are auXiliary or arcingcontacts 55. The bridging contacts 52 do not engage directly thestationary contact terminal 25,` as is the case in the usualconstruction of switches, but 1 have provided between the bridgingcontacts and the stationary contact terminal 25 additional contactmembers which will now be described.

Extending between the end frames 34 and 35 and mounted so that they havea slight rocking move'ment are four rods 56, 57, 58, and 59, each ofwhich is provided with three inclined contact supporting arms 60. Thesecontact arms are arranged in groups, each including an arm on every rod.The arms of each group are located in the same plane with one of thebridging contacts 52, and comprise two pairs located at opposite sidesof the tank. Each of these arms is provided at opposite sides, as isbest shown in Fig. 7, with flanges or ribs 61, and each has looselymounted therein a plurality of relatively movable substantially U shapedcontact "52 on the outer sides of the arms 60 are brought intoengagement with the inclined faces 28 of the Contact terminals 25 justbefore the switch is closed or before the bridging contacts are broughtinto engagement with the contact members 62 on the inner faces'of thearms 60, and this is accomplished by the following construction:

Secured to the ends of the rods 56, 57, 58, and 59 are two pairs oflevers or arms 63a and 64, each pair being connected together by coilsprings 65 and being provided at their free ends with rollers 66a. Aswas previously stated, the rod 45 carrying the bridging contacts isguided in its horizontal movement by combined camming and cross headmembers 46. These members 46 are provided near their extreme ends withinclined or cumming faces 67a which, when the switch is being closed andthe member 46 is moved horizontally, and before the bridging contactsengage the intermediate contact members 62, engagevthe rollers 66a atthe free ends of the arms 63n and 64 and spread these arms 63a and 64 soas to rock slightly the rods 56, 57, 58, and 59 and cause the contactmembers 62 adjacent the stationary contact terminals 25 to engage the.contact faces 28 of the latter. Beyond the camming faces toward the rodt5 the member 46 hasfpara-llelfaces which are engaged by the rollersduring the final closing movement of the switch. Afterpthe intermediatecontact members 62 engagerthe contact terminals 25, the bridgingcontacts 52 are brought against the adjacent contact members 62:.' Thisengagement between these members takes place before the movable switchmembers complete their closing or horizontal movement, so that theU-shaped parts of the pairs of contact members 62 are shifted toward oneanother, or-are compressed between the contact terminals and bridgingcontacts. This yielding action of the contact members 62 during thefinal closing movement of the switch and after the contact members 62are engaged by the bridging contacts, causes a relative sliding movementbetween the bridging contacts and the adjacent contact members 62 withthe result that there is a wiping and cleaning and the contact members62 move out of engagement with' the stationary contact tere minals, thisinward movement of the arms and of the intermediate contact member 62being caused by the rollers 66 riding outwardly on the inclined faces 67of the camming members 46. It'will be seen, therefore, that the circuitis broken at each pole of the switch before the intermediate con-- tactmembers 'leave the stationary contact terminals, and as a result thearcing will take place only between the auxiliary arcing contacts 55 and67, and perhaps to a slight extent between the bridging contacts and theadjacent contact members 62. Consequently, this wiping and cleaningaction takes place between the members which are subject to arcing, andtherefore the conducting or engaging faces of these members will bemaintained in a clean condition and the contacts will, therefore, havemuch greater life than the Contact terminals of ordinary switchconstructions. The bridging contacts and the intermediate contactmembers 62, the latter of which, in a sense, constitute part of thestationary contact mechanism, are included in the unit which isremovable from the tank.

The end of the shaft 38 Vis connected by trasero i,

means of'a clutch 68 to' a rod or shaft 69 extending through a bearing70 in the end of the tank 10 under a flange 71 of the tank extension l2.This rod 69 may be turned bya suitable handle to o en and close theswitch; this handle may located at any sultable place, as on. aswitch-board, the shaft 69 being of suitable length for that purpose.The handle preferably consists of two parts 72 and 73, the portion 73having a sleeve 74 which receives and is secured to the rod 69, and theportion 72 being pivoted to the portion 73 and having a ton e 75 whichcoperates with suitable notc es in a plate 76 which-is secured to theouter side of the/.switch casing. The portion 72 of the handle ispressed toward the notches of the plate 76 by means of a leaf spring 77.

As-before stated, the operating shaft 38 1s connected to the rod 69 by aclutch 68.

'The clutch includes two principal parts 78 mechanism for thesecontactmembers may be removed as a whole from the tank. The unit cannot beremoved from the tank, however, unless the tongue and slot of the clutch68 are vertical and the switch is in open position, and the unit cannotbe replaced in the tank unless the parts are in the same position. By'forming the operating parts of the switch in a unit which can beremoved as a whole without disturbing the line terminals or stationarycontact terminals, the parts can be very readily cleaned, repaired oradjusted or can have any other labor performed on them with absolutesafety to the Workman for the reason that the unit can be removed fromall live parts lat a distance from the oil tank and the switch board ifnecessary. The operator, therefore, vcan work free from obstructions andfrom thev live parts, and will not' be 'under the disadvantages that heusually encounters when working behind a switch board and working on theparts of the ordinary switch constructions. It is to be noted that theswitch can be changed from a closed position on one side to an openposition and then to a closed position on the other side by simplyswinging the operating handle from one side to the other without the useof other appliances essential to other constructions.

As before stated, the bridging contacts are capable of sidewisemovements in the tank so that the contact terminals 25 on each side ofthe switch can be connected by the bridging contact members 52 to theline terminals. Consequently, the rod 69 which is connected by -theclutch to the operating shaft 38 is mounted in the bushing 70 for rotarymovement in either direction so that the bridging contacts and theintermediate contact members are moved from one set of stationarycontact terminals 25 tou the set directly opposite in a straight line.

In order to take out the removable switch unit, it isnecessary to shiftit longitudinally of the tank in order that the intermediate contactmembers may pass the upper stationary contact members, as shown in Fig.5 of the drawings. This longitudinal shifting of the removable unit isobtained by sliding such unit along the slide rods 21 and 23a; it can bedone only when the switch isin anopen'position, and then only afterraising a latch 8l, which is secured to eX- tension 12 of the tank. Y

By providing a switch unit which can be removed only when the switch isopen and by providing in a double throw switch means for preventing thevshifting of the unit from one operative position to another, withoutthe switch going through anopen position, theremoval of the switch unitor its shifting from one position to `another can be accomplished withabsolute safety to the operator and to the switch, inasmuch as in eithercase the contacts of the movable unit are dead.

It will be seen that the arrangement and construction of contactmechanism which I have provided, is particularly adapted for use inconnection with a switch having a self-contained removable unit such asis disclosed in this application, for the reason that the intermediatecontact members, which may be considered parts of separable stationarycontact members, are out of engagement with the stationary contactterminals to which the line terminals are connected when the switch isopen. Consequently, in restoring the switch unit to its position in thetank, it is unnecessary that the two cooperating members of thestationary contact terminals be fitted together with great accuracy aswould be the case if parts of the stationary contact mechanism weremoved out of engagement on the removal of the unit and were again fittedinto engagement or in conductive relation, on the restoration oftheunit. It will be seen also that the construction and arrangement of thecontact members and the manner in which they are shifted into and out ofengagement, are such that the engaging faces of the contact members andparticularly the faces between which arcing may take place will bemaintained in a smooth and clean condition and as a result arcing willhave a less detrimental effect on the contact members than in the usualswitch construction. It willbe apparent also by arranging different setsof contact terminals on opposite sides of the oil switch, and byproviding movable lcontact members which may be shifted horizontally inthe oil tank so that either set of the terminals of the switch may beconnected to the line terminals in the manner above described, I am ableto provide a horizontal double throw switch which is compact and is verylittle larger than a single throw switch.

In this application I make no claim to such features of construction asare claimed in Patent No. 1,088,7 69, granted to H. W. Cheney. f l

There may be many modifications in the precise form and arrangement hereshown and described, and I aim to cover all such modifications which maybe made without departing from the spirit and scope of my invention asset forth in the appended claims.

What I claim as new is:

1., In a switch, a stationary contact terminal, a movable contactadapted to be shifted toward vand away from the same, a compressiblecontact member interposed between the contact terminals and the movablecontact, and means for causing said compressible contact member to bebrought into engagement with and compressed between said contactterminal and said movable contact upon the closing of the switch.

2. In a switch, a stationary contact terminal, a movable contact adaptedto be shifted toward and away from the same, a movable arm havingcontact members interposed between the terminal and movable contact butnormally out of engagement with the same, the contact members on the armbeing adapted to be compressed between the terminal and the movablecontact when the switch is closed.

3. In a switch, a stationary contact terminal, a movable contact adaptedto be shifted toward and away from this terminal, a compressible contactmember between the terminal and the movable contact and out ofengagement with both the latter when the switch is open, and means forshifting said yieldable contact member into engagement with the terminaland then for compressing said contact member between the terminals andthe movable contact.

4. In combination, in a switch, a pair of stationary contact terminals,a movable bridging contact adapted to be shifted toward and away fromthe same, Contact members between the terminals and the bridgingcontacts, and means operated by the shifting of the bridging contacttoward the terminals for causing engagement first between said Contactmembers and said terminals 1 15. In a switch, the combination of astationary contact terminal, a movable contact adapted to be shiftedtoward and awayfrom "the terminal, a plurality of movable. intermediatecontact'members'between the contact terminal and the movable contact,and means for shifting y.one of said intermediate contact members intoand out of engagement with the contact terminal and the y, movableContact into and out of engagement with said intermediate contactmembers.

said contact members into engagement with the inclined faces of theterminals and the bridging contact into engagement with said contactmembers so that the latter are compressed and a wiping action isproduced' between engaging surfaces.

17. In combination, in a switch, a plurality of stationary contactterminals, and a switchv unit movable with respect thereto and includinga bridging contact and compressible contact members, said compressiblecontact members being interposed between the terminals and the bridgingcontact and normally out of engagement with the terminals.

18. In combination, in an oil switch, an oil tank, contact terminalssupported in the tank, and switch mechanism removable as a unit from thetank and comprising movable contacts and additional contact members,said additional contact members being out of engagement with the movablecontacts and the terminals when the switch is open and being engagedthereby upon the closing of the switch.

19. In combination, in an oil switch. an oil tank, a plurality ofcontact terminals supported in said tank, line terminals connectedthereto, and switch mechanism in the form of a unit removable as a wholefrom the tank, said unit including a plurality of bridging contacts, andcontact members which are interposed between the terminals and thebridging contacts, are out of engagement with the terminals and bridgingcontactswhen the switch is open, and are engaged by said terminals andbridging Contacts upon the closing of the switch.

20. In combination, in an oil switch, an oil tank, a plurality ofcontact terminals supported in said tank, line terminals connectedthereto, switch mechanism in the form of a unit removable as a wholefrom the tank, said unit including a plurality of bridging contacts, andcontact members which are interposed between the terminals and thebridging contacts, said contact members being out of engagement with theterminals and the bridging contacts when the switch is open and beingengaged thereby upon the closing of the switch, and releasable means forpreventing the removal of the unit. a

21. In combination, in an oil switch, an

loil tank, a plurality of fixed contact terminals supported in saidtank, and a switch unit removable as a whole from the tank, said unitcomprising a supporting frame, bridging contacts mounted for movement insaid frame toward and away from the terminals, a pair ofl rods supportedin. said frame, and contact members carried by vsaid rods and locatedbetween the terminals and bridging contacts, said rods being movable so'that the contact members supported thereby may be swung into and. outof engagement with the terminals4 when the switch is being closed andopened respectively.

221 In combination, in an oil switch, an oil tank, fixed contactterminals supported in said tank, and a self-contained switch imitremovable as. awhole from the tank, said unit comprising a supportingframe, an operating shaft, a rod having a plurality of movable bridgingcontacts adapted to be shifted by said shaft, and a pair of rodsrotatably mounted in the frame, said rods carrying contact membersadapted to be engaged by the bridging contacts and to be swung into andout of engagement with the terminals when the switch is being closed andopened respectively.

23. In combination, in an oil switch, an oil tank,A fixed contactterminals supported in said tank, a self-contained switch unit removable'as a whole from the tank, said unit comprising a supporting frame, anoperating shaft, a rod having a plurality of movable bridging contactsadapted to be shifted by said shaft, and a pair of rods rotatably'mounted in thev frame, said rods carrying contact members adapted to beengaged by the bridging contacts and to be swung into and out ofengagement with the terminals when the switch is being closed and openedrespectively, and means for preventing the removal of the unit exceptwhen the switch 1s open.

24. In an oil switch. the combination of a tank, a contact located insaid tank, removable switch mechanlsm comprising two Jm'ovable contactsone of whlch 1s movable into IDO vso

and out of engagement with said contact terminal and the other ismovable into and out of engagement with the first, and com- 26. In anoil switch,.the combination of' an oil tank,"'a' lpair of contactterminals located in 'said tank, switch mechanism'removable as a unitfrom the tank, sald switch mechanism comprising a frame, a bridging icontact, and a pair of intermediate contacts carried by said fran-1e andnormally'out of engagement with one another and with the contactterminals, and means for moving said bridging contact and saidintermediate contacts to connect one contact terminal to the otherthrough one intermediate contact,

the bridging contact, and the other intermediate contact in series.

27. In an oil switch, the combination of an oil tank, a pair of contactterminals 1ocated in said tank, switch mechanism removable as a unitfrom the tank, said switch Y mechanism comprising a frame, a bridgingcontact, and a pair of intermediate contacts carried by said frame andnormally out of engagement with one another and with the contactterminals, and means for moving said bridging contact and saidintermediate contacts to connect one contact terminal to the otherthrough one intermediate contact, the bridging contact, and the otherintermediate contact in series, and to'disconnect one contact terminalfrom the other by irst separating the bridging contact from theintermediate contacts and then separating the intermediate contacts fromthe contact4 terminals.

28. In an oil switch, the combination of van oil tank, a pair of contactterminals located therein, switch mechanism removable as a unit fromsaid tank, said switch mechanism comprising a bridging contact and apair of intermediate contacts, and means for closing the switch bymovingfirst said intermediate contacts into engagement with the respectivecontact terminals and then the bridging contacts into engagement withsaid intermediate contacts, and for opening the switch by separatingfirst the bridging contact from the intermediate contacts and then theintermediate contacts from the contact terminals.

'normally out of engagement with one anotherand with the contactterminals but being movable some into engagement with said contactterminals and others into engagement with the contacts which engage saidterminals, and said frame being movable transversely to the plane orplanes of movement of said movable contacts.

30. In an oil switch, the combination of a tank, contact terminalsmounted in said tank, switch mechanism removable from said tank as aunit and comprising a frame carrying contacts which are movablerelatively to said frame some curvilinearlyand the rest rectilinearly,and means for moving thecurvilinearly movable contacts into engagementwith the contact terminals and the rectilinearly movable contact orcontacts into engagement with the curvilinearly movable contacts, saidframe being movable transversely to the direction of movement of saidrectilinearly movable contact or contacts.

31. In an oil switch, the combination of a tank, contact terminalsmounted` in said tank, switch mechanism removable from said tank as aunit and comprising a frame carrying contacts which are movable inplanes relatively to'said frame some curvi- 100 linearly and the restrectilinearly, and means for moving the curvilinearly'movable contactsinto engagement with the contact terminals and the rectilinearly movablecontact or contacts into engagement with the curvilinearly movablecontacts, said frame being movable transversely to the planes ofmovement of said curvilinearly movable contacts.

32. In an oil switch, the combination of an oil tank, a group of contactterminals located in said tank, and switch mechanism removable asa unitfrom said tank, said switch mechanism comprising a frame which isrectilinearly slidable in the tank and contacts which are movablerelatively to said frame, one or more of said contacts being movableinto and out of engagement with contact terminals and another or othersinto and out of engagement with those contarts which may engage thecontact termina s. f

33. In an oil switch, the combination of an oil tank,a group of contactterminals 1ocated in said tank, and switch mechanism removable from saidtank as a unit, said mechanism comprising a frame which may be liftedfrom the tank and is slidable horizontally in the tank, and contactsmovable relatively to said frame in planes substan- 13o tiallyperpendicular to the direction in which said frame is horizontallymovable, one or more of said movable contacts being movable into and outof engagement with contact terminals and another or others into and outof engagement with those contacts which may engage the contactterminals.

3a. In an oil switch,- the combination of an oil tank, a group ofcontact terminals located insaid tank, switch'mechanism removable as aunit from said tank, said switch mechanism comprising a frame which isrectilinearly slidable in the tank, and contacts which are movablerelatively to said frame, one or more of said contacts being movableinto and out of engagement with contact terminals and another or othersinto and out of engagement with those contacts which may engage theContact terminals, and common operating means for the movable contacts.35. In an oil switch, the combination of an oil tank, a group of contactterminals located in said tank,'switch mechanism removable from saidtank as a unit, said mechanism comprising a frame which may be liftedfrom the tank and is slidable horizontally in the tank, and contacts`movable relatively to said frame in planes substantially perpendicularto the direction in which said frame is horizontally movable, one ormore of said movable contacts being movable into and out of engagementwith contact terminals and another or others into and out of engagementwith those contacts which may. engage the contact terminals, and commonoperating means for the movable contacts. 3G. In an oil switch, thecombination of an oil tank, contact terminals located in said tank, andswitch mechanism removable from said tank asa unit, said switchmechanism comprising a frame which may be lifted from the tank and whichis slidable hori` zontally while in the tank and movable contactscarried by said frame and movable relatively thereto in a plane orplanes transverse to the horizontal direction in which said frame isslidable, some of said contacts being movable into and ont of engagementwith contact terminals and one or more others of said contacts beingbridging contacts movable into and out of engagement with those contactswhich have been moved to engage contact terminals;

37. In an oil switch, the combinationfof an oil tank, parallel rodsmounted in said tank, one or more switch terminals mounted on each ofsaid rods, and switch mechanism removable as a unit from said tank andcomprising a. frame which is slidable in the tank in a directionsubstantially parallel to said rods, and contacts mounted in said frameand movable relatively thereto in a plane or planes transverse to saidrods, some of said contacts being movable into and out of engagementywith contact terminals and one or more others being bridging contactswhich are movable to interconnect a pair or pairs of the contacts whichhave been moved into engagement with contact terminals.

38. In an oil switch, the combination of an oil tank, rodsmounted insaid tank, one or more contact terminals mounted on each of said rods,and switch mechanism which is movable as a unit, said switch mechanismcomprising a frame including rotatable rods parallel to, said firstnamed rods, said frame being slidable in said tank in a directionparallel to the rods, contact members mounted on the rotatable rods andmovable by the rotation of said rods into and out of engagement withsaid contact terminals, and one or more bridging contacts carried bysaid frame and movable to interconnect one or more pairs of therotatably mounted contacts which have been brought into engagement withcontact terminals.

39. In an oil switch, the combination of an oil tank, contact terminalslocated in said tank, and switch mechanism movable as a 1 unit andcomprising a horizontally movable Y frame carrying a plurality ofcontacts movable relatively to the frame in a vertical plane or planes,some of said contacts being movable into and out of engagement withcontact terminals and one or more others being bridging members movableto interconnect in pairs contacts which have been moved into engagementwith contact terminals.

40. In an oil switch, the combination of an oil tank, contact terminalslocated in said tank, and switch mechanism movable as a unit andcomprising a rectilinearly movable frame carrying a plurality ofcontacts movable relatively to the frame in a plane or planes transverseto the direction in which the frame is movable, some of said contactsbeing movable into and out of engagement with contact terminals and oneor more others being bridging members movable to interconnect in pairscontacts which have been moved into engagement with contact terminals.

4l. In an oil switch, the combination of an oil tank, contact terminalslocated in said tank, switch mechanism movable as a unit and comprisinga rectilinearly movable frame carrying a plurality of contacts movablerelatively to the frame in a plane or planes transverse to the directionin which the frame is movable, some of said contacts being movable intoand out of engagement ,with the contact terminals and one or more othersbeing bridging members movable to interconnect in pairs contacts whichhave been moved into engagement with Contact terminals, and commonoperating mechanism for the contacts carried by said frame.

42. In a switch, a stationary contact ter- IIO minal, a movable contactvadapted to be shifted toward and away from said stationary contactterminal, an intermediate cOntact between said stationary contactterminal and said movable contact, and means for effecting by oneoperation relative movement between said stationary and intermediatecontacts and relative engagement between` said intermediate and movablecontacts.

43.\In combination, in an oil switch,-an oil tank, contact terminalssupported therein, switch mechanism removable as a unit from said tankand comprising a contact movable at anA angle to the direction ofremoval of said unit, 'and an intermediate contact adapted to be engagedby the movable contact and the contact terminal.

4:4. In a switch, the combination' of a group of more than two contacts,a bridging contact, an operating shaft, and opposltely disposed toggles.connecting said bridging contact andvsaid operating shaft, and guiding,on the actuation of said shaft, to cause said bridging Contact to engagedifferent pairs of said groups of contacts accordingly as the shaft isturned in one direction onanother.

' Milwaukee, Wisconsin, February 1, 1910.

mg means. cooperating with said bridging, contact, said toggles andguiding means act- In testimony whereof I aflix my signan lture, in thepresence of two witnesses.

BRADLEY HASKINS.

Witnesses:

Cms. L. BYRON,- Ro. E. STALL.

